Question

Which of these equations can be written in the residual form?

(a) The discretized equations

(b) The governing equations

(c) The PDEs

(d) The ODEs

This question was addressed to me during an interview for a job.

This is a very interesting question from Relaxation in section Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

Answer 1

Correct answer is (a) The discretized equations

Easy explanation: The residual form can be taken by the discretized algebraic equation. While the other form of the equation is called the standard or direct form, the residual form can also be called correction form.